自定义按钮文本

通过自己创建 ButtonType 实例，可以自定义按钮中显示的文本：

ButtonType answer = new ButtonType("42");
ButtonType somethingElse = new ButtonType("54");

Alert alert = new Alert(Alert.AlertType.NONE, "What do you get when you multiply six by nine?", answer, somethingElse);
ButtonType result = alert.showAndWait().orElse(somethingElse);

Alert resultDialog = new Alert(Alert.AlertType.INFORMATION,
                               answer.equals(result) ? "Correct" : "wrong",
                               ButtonType.OK);

resultDialog.show();